Hi, apologies if this is a repeat thread, for what I’ve read, this is a common problem with Passats.
RE: VW PASSAT 2.0 TDI 2012 Bluemotion
Last month my clutch went soft then it got stuck to the floor and didn’t return back to its position. The first thing I did was call RAC. They topped up the brake fluid because it was low, pumped the clutch a few times and it got back to normal function, but the next day, after about a 15-minute drive on the motorway, it went again.
I then took it to a garage, where they changed the master cylinder. Immediately after picking it up, the clutch kept getting sticky and as soon as I went on the motorway, it started going again.
I was then told by this garage that it was probably the slave cylinder that will need replacing, but considering the cost of replacing the slave cylinder, I decided to get it checked again at a different garage first. This other garage told me that most likely the new master cylinder is faulty or was damaged when fitted in, and they didn’t think it was the slave cylinder, because apparently the clutch box where the slave cylinder is, has a drain hole which they checked and apparently was dry.
I then went back to the first garage to discuss the issue again and was told that it was highly unlikely the new part is faulty, they still believed the slave cylinder is faulty but they said another common fault with these cars is the “pressure relief valve” so they said they would check/replace this before the change the slave cylinder (and clutch).
My question is, how likely is it that the fault is somewhere else and not the slave cylinder? The thing that’s making me question this is that after I pump the clutch a few times, then if I drive the car at a slower speed ie. on local roads, the clutch works absolutely fine, it’s only when I drive at a high speed on the motorway it’s when it gets sucked to the floor. Does this pressure relief valve have anything to do with this?
Any help is much appreciated!